Fast Scsi Timing Specifications - Fujitsu MCE3064SS Product Manual

No. Name
17 Transfer Period
No. Name
18 Fast Assertion
Period
19 Fast Cable Skew
Delay
20 Fast Deskew
Delay
21 Fast Hold Time
22 Fast Negation
Period
7 - 12
Table 7.6 Timing specifications (3 of 3)
Standard
– In synchronous data transfer mode, the minimum
time (minimum repetition time) from the leading
edge of an REQ signal to the leading edge of the
next REQ signal or from the leading edge of an
ACK signal to the leading edge of the next ACK
signal. The actual value is defined using a
SYNCHRONOUS DATA TRANSFER REQUEST
message exchanged between the INIT and TARG.
Table 7.7

FAST SCSI Timing specifications

Standard
30 ns min. In FAST SCSI data transfer mode, minimum pulse
width of an ACK signal sent by INIT and an REQ
signal sent by TARG for synchronous data transfer.
5 ns max. In FAST SCSI data transfer mode, maximum
allowable difference in transmission time over the
interface cable between any two bus signals from
any two SCSI devices.
20 ns min. In FAST SCSI data transfer mode, time for
compensation for skew involved in bus signal
transmission.
10 ns min. In FAST SCSI data transfer mode, the minimum
time during which the transfer data on the DATA
BUS from the leading edge of the REQ or ACK
signal pulse must be maintained to compensate for
the hold time in the SCSI device receiving data.
30 ns min. In FAST SCSI data transfer mode, the minimum
time from the trailing edge of an REQ signal to the
leading edge of the next REQ signal,, or from the
trailing edge of an ACK signal to the leading edge of
the next ACK signal.
C156-E097-01EN
Timing specification
Timing specification